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Related Parties Transactions with DowDuPont (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Nov. 02, 2017
Related Party Transaction [Line Items] |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  | $ 4,000
Distributions to DowDuPont | $ 317 | $ 831 |  |
DowDuPont [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Distributions to DowDuPont | 317 | $ 830 |  |
Accounts Payable, DowDuPont | $ 103 |  | $ 103 |

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